Mold for founding



Dec. 22, 1931. G FURMA 1,837,320

MOLD FOR FOUNDING Filed Sept. 20, 1929 5 Sheets-Shet l Dec. 22, 1931. 'Q 1,837,320

MOLD FOR FOUNDING Jill- 1. E

.Deb. 22, 1931. e. FURMAN MOLD FOR FOUNDING' 5 Shets-Sheet 3 Filed Sept. 20, 1929 Dec. 22, 1931. G. FURMAN mom: FOR FOUNDING Filed Sept. 20. 1929 5 Sheets-Sheet 4 I H. v w

Dec. 22, 1931. G. FURMAN 1,837,320

MOLD FOR FOUNDING Filed Sept. 20, 1929 5 Sheets-Sheet 5 enonen Fireman; or cmcaeo,

.to provide: slmging wads of sand into flasks, so the sand UNITED STATE PATENT IQFFICE rumors; assrenon To rent BnAnnsLEYa PIPER,-

' COMPANY, CHICAGO, ILLINOIS, A GORPOBATION OF ILLINOIS MOLD FOR FOUN DING Application area September 20, 1929. Serial No. 393,869.

The invention relates to making molds for founding. V j

The principal objects of the invention are a method and vmechanism for immediately adjacent the patterns will be packed withless density to permit-expansion of the metal, and the sandat the outside of the flask will be moredensely packed to pre vent disintegration in flasks; mechanism for slinging means of rotary high-speed projectors, flasks so diiierent zones will be packedin sand, by

different densities; an improved method and machine for expediting the filling of the flasks and preventing wear on the patterns, by depositing loose-sand on the patterns and then slinging wads of sand at a suflicientlyhigh speed on top of the loose sand .to pack the sand densely around the patterns; an improved automatically operating machine of the rotary projector type performing all operations necessary in filling the flasks; and an improved machine witha plurality of ro- =i tary projectors for expediting the filling of molds on a travelling conveyor. 7 Other objects of the invention willbe apparent from a consideration of the following detailed description. j

The invention consists in the several novel features which are hereinafter set forth and are more particularly defined by the append ed claims. p p 7 In the drawings which accompany and form a part of this specification or disclosure and in which like numerals of reference de note corresponding parts throughout the several views: Fig. l is a plan of a machine embodying the invention, the sand-feeding mechanism above the projectors being omitted. Fig. 2 is a lan of the mechanism for feedingsand to tile rotary projectors ofthe machine; Fig. 3 is aside elevation, parts being shown in section; Fig. 4 is asection taken on the line lfl of Fig. 3. Figs. 5 and 6 are transverse and longitudinal sections, respectively, of one of the projectors. Fig. 7 is a diagram showingthe method of packing sand in a flask. Fig.8 is a section showing the pivotal mount for the projectorhandling the filled into arms. Fig. 9 is a plan of the guide through which the wads of sand are projected. Fig. 10 is an end elevation of said guide; Figs.

11 and 11 are detailsof the strike for-level glllg the sand on the top of the rammed flask.

ofthe mechanism for swinging the projec tors horizontally. Fig. l l is a section on line l4l-14 of Fig. 18. Fig. is a diagram of the electric-connections for controlling all of the various motors. p

The invention is exemplified in a machine comprising an endless power-driven V tableconveyor A for moving flasks a and patternframes a at a uniform predetermined speed in substantially horizontal plane; a tank C for holding a supply of sand for filling the flasks; a riddle D for delivering loose sand into the flasks; an endless power-driven apron-conveyor E for feeding sand in a regulated stream from tank G to riddle D; a pair of rotary projectors B, 13 mounted to oscillate transversely over the moving flasks; an endless power-driven apron-conveyor F i for 12 is a detail ofthe support for the outer ends of the proj ector-arms. Fig. 13 is a plan.

feeding sandin a-regulated stream to ahopper 22 which is mounted to swing with the projectorsand directs sand onto feed belts 19 for the projectors; power-driven mechanism G for swinging the projectors horizontally; and suitable frame-work H for. supporting the several mechanisms of the machine. j

Conveyor A comprises a sprocket-chain a, which travels around three sprocketwheels a plates a secured to said chain and adapted to support frames 0 on the top of which theflasks a are laidand patterns a are suitably mounted for withdrawal from the molds, rollers a mounted in stationary frame-.

work a 'andserving to support plates (1 an electric motor a and reduction gearln g a for drlvmg one of the sprockets a to operate v riddle D'so they will be filled with loose sand. This riddle is positioned over the conveyor A, and consists of a hopper (Z With a screen cl and an opening in its bottom so the sand will gravitate into the moving flasks on conveyor A. One end of this hopper is slidable on a bar (Z and its other end is connected to an eccentric (Z on a shaft d An electric motor 6Z5, mounted on framework H, is connected to drive shaft cl and vibrate the riddle to cause the sand to pass through the screen 0?.

Conveyor E, which feeds sand to riddle D, comprises an apron e of slats trained around pulleys e, 0 The upper reach of this apron passes under an opening in the bottom of tank C and carries the sand through an end opening 6 in the tank, and discharges it in a continuous stream into riddle D. A. gate 6 is slidably mounted on tank C to vary the eii'ective area of the discharge opening e and regulate the rate of flow of the sand to the riddle. An electric motor 6 mounted on framework H, drives the conveyor E through suitable reduction gearing e, to supply the sand continuously to the riddle.

After the flasks have been filled with loose riddled sand, they successively pass under the projector B which slings wads of sand onto the loose sand to pack the latter around the patterns a in such a manner as to permit of expansion of the metal, and then under projector 13 which is operated at a higher speed to sling wads of sand with sulficient force to pack more densely the top portion of the mold and form a relatively hard backing for the zone of sand around the pattern. Conveyor F, which feeds a stream of sand to the projectors, comprises an apron f of'slats trained around an idler f and a drive pulley f The upper reach of apron f passes under an opening in the bottom of tank C and operates to carry a stream of sand through an end-opening f in the tank and to discharge the sand into hopper 22 which directs the sand to the feed-belts 19 on the projector-arms. A gate f is slidably mounted on the tank and serves to adjust the effective area of the discharge opening and regulate the rate of flow of sand to the projectors. An electric motor 7, mounted on the framework H, drives apron f through reducing gearing 7, to supply the sand continuously to the projectors. A deflector 0 with downwardly divergent sides. distributes the sand in tank C to conveyors E and F.

Each projector comprises a casing 15, secured to the distal end of a tubular arm 14; a shaft 17, extending through the arm and into the casing; and a tangential blade 18 fixed to the shaft and coacting with an arouate liner 15 to pack sand entering the casing through an opening-15 into wads and to project the wads downwardly through an opening 15. An electric motor 16, secured r to the other end of arm 1 1, has its rotor secured to drive shaft 17. An endless belt 19 is mounted on each arm, extends around an idler 21 and a driven pulley 20 on the arm, and feeds a stream of sand from hopper 22 to the projector. Pulley 20 is driven from shaft 17 by enclosed gearing, as exemplified in Patent No. 1,408, l93. The blades 18 of 'the two projectors l3 and B are disposed longitudinally of each other and driven in opposite direction, and openings 15 are formed at the inner sides of the casings, so the wads from both projectors will be projected longitudinally of and in close proxim ity to each other and lodge on successively formed portions of the molds.

The motor for the projector B drives its projector-blade at a sul'licient speed so the loose sand in the flask will be packed with the desired density around the pattern by the projected wads. A speed of 1200 revolutions per minute, with a blade having a radius of 8 inches, has been found suitable for this purpose. The motor for projector B drives its blade at a higher speed to project wads with sufficient force to pack the top Zone of sand with suflicient density to provide a relatively hard packing on the top of the packed sand previously packed around the pattern. In practice a speed of 1800 revolutions per minute with .a blade having an 8 inch radius has been found to produce this result. This higher speed causes the wads to be densified to a greater degree by centrifugal force while in the projector casing, and causes them to be projected with greater force.

A box I with an open top and bottom is fixedly mounted over the flask-path and under the projectors, and comprises side-walls 2' an end-wall 2' cross-walls 2' 2' and an endbar 2'. The lower edge of wall i extends to the level of the top of the flask and strikes off all loose sand above that level, so there will be a uniform quantity of sand in the flasks when the wads are projected first into the flasks. The wads from projector B pass through the space between walls 2' it, and these walls serve to prevent the scattering of thesand in the flasks by the wads. The wads from projector B pass through the space between wall 2' and bar 11 which prevent scattering of the sand by said wads. BOX I has legs 2' which are secured to fixed plates 2' by bolts and slot connections (not shown) so the box can be adjusted into operative relation with the tops of flasks of different heights. A series of teeth 2' in bar 2' extend downwardly to the top level of the flasks, to loosen the packed excess sand above that level, so it can be removed by a strike J, which consists of a three-edged crossbar which has studs 7' pivoted in bearings j A spring j is applied to yieldingly hold the strike so its lower margin will be in the path of the front end of the flasks, so they will rotate the strike until itsrearwedge will be transversely of theflask-path inorder to a worm 38 meshing with gear'37 traversethe entire width of the flasks and project wads into all portions of the flasks.

For'vthis purpose, the arms 14 of both projectors are fixedflon a plate 14; having a socket lei which is journalled, ona vertical stud 14 which is fixed to cross-beams h-. This pivot is adjacent the motors 16. Beams, it are supported above the -flask-path by standards 72?, so the flasks and flask-conveyor will travel beneath the projectors. A roller b in a bracket 6 secured to the projectorarms 14:, travelson a track-plate I) to support the outer or distal ends of the projector arms. Said plate 6, is fixed on a crossbeam 72. supported by standards 7%. ,Mechanism for oscillating the projectors comprises a continuously rotating disk 24 ona shaft 25.which is journalled in a housing 26; a link 27 which is pivoted to .a wrist-pin 28, on the disk, and, at 29, to'a bracket 29 which is clamped to both of the projectorarms 14; a worm-gear 3T fixed to shaft25; and an electric motor 39, to the shaft of which the worm is secured. Housing 26 is supported by a suitable framework 72. at one side ofthe flask-conveyor. lVrist-pin 28 is slidably adjustable on disk2 l so the stroke of the projector-arms may be varied to correspond to the width of the flasks.

As shown in Fig. 15, motor a which drives the conveyor A; motor (Z which vibrates the riddle D, motor 6 which drives conveyor 6, motor f which drives convey-or F,.the pros jector motors'16, and the motor 39 for driving the projector oscillating mechanism are connected in parallel to" a singleelectrical circuit which is controlled by a switch K. By shifting this switch, all ofthe driven mechanisms otthe machine will be simultaneously started or stopped. This insures the necessary synchronlzation between the several mechanisms for properly filling the The operation of the machine is as follows: To start the entire machine, the operator will close switch K, which will cause all the motors to operate. Empty flasks will be placed on the pattern frames 64 on the conveyor A. at the loading station A which will continuously convey them until they are removed at the unloading station A The flasks will successively pass under riddle D and be filled with loose sand. This will prevent the'wads of sand directly onto, the patterns in the flasks to.

oft the loose sand 1n he-l o e' ling if pr j s t -d;

ral y movi proje or 3 I delivered at high 7 speed by projector B from being impacted P ev t th -abr sio an ut ing way o thefpat'terns by the initial wads deposited into the flasks, fillingops at n- As th fl s s, ucces ively pass under bozg 1, wall 2'? will strike or, level the flasks to the top level of the fl sks, s th t e v lum f loose and n he fi s sw-i l be un f rm en y reach the projector B. Next, the moving flasks pass under bog: Land wads of sand trom said projector will be projected onto wee wel 63 nd 2 the loose sand around These wads will pack red. de s ty casting w tho t b ing These walls will prevent the wads from displacing the loose sand. meri of t e pr i st r. 13

across the entire width of the moving flasks. Next. mov ng flas pa unde h in: hic w ll P17 ject wads of sand with greater force between wall i and bar 2' and onto the packed bed of sand in the flasks, so it will be backed with sand of the density desirable to prevent disintegration of the molds in transporting and handling them. to make the, copes and drags. Next, the flasks pass under teeth 1' whichwill break up. the sand packed above the level ofthe topfof the flasks. Next, the front ends of the flaskswill oscillate the strike J into position to scrape the sand above said level.- As the flasks pass under molds will be'lifted off the pattern frames a", so that said frames can be loaded again, when they reach theload ng stat on.

The invention has been illustrated; in connection I with molds for radiatorscastings, and

is of especial advantage in making shallow molds, which can be produced by coord nat- 1ng the movements of a laterally movable projector and continuously conveyed flasks, to

fill all portions of the flasks.

The invention-exemplifies. a method of and mechanism for projecting wads of sand into flasksto, produce molds with sand packed with different degrees of density; mechanism. for successively filling flasks with loose sand and then densifying it, around the patterns-by projecting wads onto the loose sand to protect the patterns from abrasion by the wads and to expedite the filling of the flasks; an improved machine for continuously and expeditiously and completely -,fQ1"-ming shallow molds; and an improved machine adapted to,

produce a large output of molds.

T e in nt n, i n t to b und rs o d as restri ted to. he d ta ls s t fo th. si ce, hese and n will also expedite the a d in he flasks, and be..

he Pat erns with the directly again t h patterns.-

Ths ter m e-- imparted to it by V the motor 89 will cause wads to be projected may be modified within the scope of the appended claims, without departingfrom the spirit and scope of the invention.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a molding machine, the combination of a rotary projector adapted to sling wads of sand into a flask, a second projector for slinging wads of sand onto the sand packed by the first projector, means for feeding sand to the projectors, means supporting both projectors for conjoint movement over the flask, and mechanism for driving the projectors.

2. In a molding machine, the combination of a rotary projector adapted to sling wads of sand into a flask, a second projector for slinging wads of sand onto the sand packed by the first projector, means for feeding sand to the projectors, means supporting both proj ectors for conjoint movement over the flask, driven mechanism for moving the projectors over the flask, and mechanism for driving the projectors.

3. In a molding machine, the combination of a rotary projector adapted to sling wads of sand into a flask, a second projector for slinging wads of sand onto the sand packed by the first projector, means for feeding sand to the projectors, and mechanisms for driving the projectors in opposite directions, so the wads from both projectors will be discharged at points close together.

4:. In a molding machine, the combination of a rotary projector ada ted to sling wads of sand into a flask, a secon projector for slinging wads of sand onto the sand packed by the first projector, means for feeding sand to the projectors, pivotal supporting means whereby the projectors may be swung conjointly over the flasks, and mechanism for driving the projectors.

5. In a molding machine, the combination of a conveyor for flasks, a rotary projector adapted to sling wads of sand into flasks on the conveyor, a second rotary projector to which the conveyor successively delivers the flasks, adapted to be driven simultaneously with the first projector and to sling wads of sand onto the sand packed by said first projector, means for feeding sand to the projectors, mechanisms for driving the projectors, means to support the projectors pivotally so that they are free to swing laterally over the flasks on the conveyor, mechanism for automatically swinging the projectors laterally, and mechanism for driving the conveyor to pass the flasks successively under the projectors.

6. In a molding machine, the combination of a rotary projector adapted to sling wads of sand into a flask, a second projector for slinging wads onto the sand packed by the first projectors, means between the projector and the flask to confine sand in the flask by the wads, means for ieedmg sand to the pro ectors, and mechanism for driving the projectors.

7. in a molding machine, the combination of a conveyor for flasks, a rotary projector adapted to sling wads of sand into flasks on the conveyor, a second rotary projector to which the conveyor successively delivers the flasks, adapted to sling wads of sand onto the sand packed by the first projector, means for feeding sand to the projectors, mechanisms for driving the projectors, means to support the projectors for lateral movement over the flasks and transversely to the movement of the conveyor, walls over the flasks and under the projectors, between which the wads are projected, and mechanism for driving the conveyor to successively pass the lasks under the projectors.

8. in a molding machine, the combination of a pi .lity of projectors adapted to sling wads o and into a flask to pack the sand in relatively different densities, means for feeding sand to the projectors, and mechanism for driving the projectors.

9. in a molding machine, the combination of a plurality of projectors adapted to sling against displacement wads of sand into a flask to pack the sand in rela ivcly different densities, means for feedsand to the projectors, means to support the projectors for lateral movement over the flask, and mechanism for driving the projectors.

it). In a molding machine, the combination of a plurality of projectors adapted to sling wads of sand into a flask to pack the sand in relatively dilierent densities, means for feeding sand to the projectors, means to support the projectors for lateral movement over the flask, mechanism for automatically shifting the projectors laterally over the flask, and mechanism for driving the projectors.

ll. In a molding machine, the combination of a rotary projector for slinging wads of sand into a flask, a second projector for slinging wads onto the sand rammed by the first projector, means for feeding sand to the projectors, and means for driving the projectors at relatively different speeds, to ram the sand in different densities.

12. In a molding machine, the combination of a plurality of projectors adapted to sling wads of sand into a flask to pack the sand in relatively different densities, means for feeding sand to the projectors, and mechanism for driving the projectors, in opposite directions so that wads will be discharged at points close together.

13. In a molding machine, the combination of a conveyor for flasks, a plurality of projectors adapted successively to sling wads of sand into the flasks on the conveyor, and to ram the sand in relatively different densities, means for feeding sand to the projectors, and mechanism for driving the projectors.

ferent densities,v

ferent densities, means for a 14. In a moldingmachine, the combination of a conveyor for flasks, a plurality of projectors movable laterally overl the flasks on the conveyor, and adapted successively to sling wads of'sand into the flasks on the conveyor, and toramthe sand in relatively diffeeding'sand to the projectors, and mechanism for driving the projectors. q

15. In a molding machine, the combination of a conveyor for flasks, a plurality of projectors movable on the conveyor andadapted successively to sling wads of sand into the flasks on the conveyor, and to ram the, sand in relatively difmechanism for laterally shifting the projectors, means for feeding sand to the projectors, and mechanism for driving the projectors.

16. In a moldingmachine, the combination of a conveyor for flasks, a plurality of projectors, adapted successively to sling wads of sand into the flasks on the conveyor, an'd'to' ram the sand in relatively diflerent densities,

mechanism for driving the conveyor, mechanism for shifting the projector, means for feeding sand to the projectors, and mechanism for driving the projectors.

17 In a molding machine, the combination of a conveyor for flasks, a rotary pro-' jector to which the flasks are first conveyed, adapted to sling wads of, and ram, the sand into the flasks, a second projector to which the flasks are. thereafter conveyed, adapted to sling wads into the previously rammed sand, and to pack the sand with greater density, means for feeding sand to the proj ectors, and mechanism for driving the projectors.

18. In a molding machine, the combination of a conveyor for flasks, a rotary projector to which the flasks'are first conveyed, adapted to sling wads of, and ram, the sand into the flasks, a second projector to which the flas rs are thereafter conveyed, adapted to sling wads onto the previously rammed sand, and to pack the sand with greater density, means for feeding sand to the proje'ctors, said projectors being laterally movable, mechanism for laterally shifting the projectors, mechanism for driving the conveyor, nism for driving the projectors.

19. In a molding machine, the combination of a conveyor for flasks, a rotary projector to which the flasks are first conveyed, adapted to sling wads of, and ram, the sand into the flasks, a second projector to which therflasks are thereafter conveyed adapted to sling wads onto the previously rammed sand, and to pack the sand with greater density, means for feeding sand to the projectors, and mechanism for driving the projectors in opposite directions and at relatively-difl'erent speeds.

20. In a molding machine, the combination laterally over the flasks ,,conveyed for slinging wads 'sand to ramit aroundthepattern, a second delivering loose, sand onto flasks on the conveyor, a rotary pro ector to conveyed for slinging vvads ontothe and mechaof a driven conveyor for flasks,a riddle for delivering loose sand onto patterns in1the flasks. on the conveyor,'a rotary projector to which the flasks containingloose sand are conveyedfor slinging wads onto the loose sand to ram it around the pattern,a second projector to which the flasks with rammed sand are conveyed for slinging wads onto the rammed sand in the ering sand to'the' riddle andthe projectors, and mechanism for driving the projectors.

,7 21, Ina molding-machine, the combination of a driven conveyor for 'flasks, a riddle for deliveringloose sand ontopatterns in the flasks-on the conveyor, a rotary projector to which the flasks containing loose sand are ontothe loose projector to which the flasks with rammed sand are conveyed, for sllnging wads onto the rammed sand in the flasks, and ramming the sand on the top density, means for of the flask to greater delivering sand to the riddle and the projectors, and mechanism for driving the projectors. i i

' 22.-In a molding machine,.the combination of a driven conveyor for a rotary projector to conveyed,for slingingwads onto the loose flasks, a riddle for delivering loose sand onto patterns in the flasks on the conveyor, which theflasks containing loose sand are flasks, means for delivsand toram it around the pattern, means over the; flask to confine the sand in theflask against displacement by the wads, means for delivering sand to the riddle jector. V i

28. In a molding machine, the combination of a driven conveyor for flasks, 'a-riddle' for loose sand are :loose sand to ram it around the pattern, a=second projector to which the flasks withrammed which, the flasks containing sand are conveyed, for slinging'wads'onto'the rcmmed sand in the flasks, means over the flask toconflne the sand in the flask against displacement by the wads, means for deliver- .ingsaid to the riddle and the projectors,

an d mechanism for driving theprojectors.

24. That improvement in making molds,

-which consists in covering the patterns in .which consists in covering the patterns in flasks with loose sand,

thenprojecting' wads of sand at a given velocity onto the loose sand to ram it around the pattern, and then projecting wads at a higher speed onto the previously rammed san'd. r

and to thepro- -jector, and mechanism for driving the propatterns in the 26. That improvement in making molds which consists in simultaneously slinging wads of sand at relatively diflerent velocities to ram with diflerent densities in successively formed portions of the mold.

27. That improvement in making molds which consists in slinging wads of sand at one Velocity to ram one portion of a mold and simultaneously slinging wads of sand at a greater velocity onto the previously rammed sand.

28. In a molding machine, the combination of a driven conveyor for fiasks,a riddle for delivering loose sand onto patterns in the flasks on the conveyor, a rotary projector to which the flasks containing loose sand are conveyed, mounted to move laterally over the flasks on the conveyor, and for slinging wads onto the loose sand to ram it around the pattern, means to level off the loose sand in the flasks while in transit to the projector, means for delivering sand to the riddle and to the projector, and mechanism for driving the projector. v p

29. In a molding machine, the combination of a conveyor for flasks, a tank for a supply of sand, a riddle for delivering sand into flasks on the conveyor, a driven apron-conveyor for feeding sand from one end of the tank to the riddle, a projector for slinging wads of sand into the flasks, mechanism comprising a driven apron-conveyor for feeding sand from the other end of the tank to the projector, said tank being disposed above the projector and the riddle, and driving mechanisms for the flask-conveyor and the projector.

30. In a molding machine, the combination of a pair of sand projectors, each comprising a projector-blade, a supporting arm, a motor at one end of the arm, and a sand-conveyor on the arm, said arms being secured together, a pivotal support on which both arms can swing laterally,one of said blades being mounted to rotate longitudinally of the other.

31. In a molding machine, the combination of a pair of sand projectors, each comprising a projector-blade, a supporting arm, a motor at one end of the arm, and a sand conveyor on the arm, said arms being secured together, a pivotal support on which both arms can swing laterally, one of said blades being mounted to rotate longitudinally of the other, the motors being adapted to drive the blades in opposite directions.

32. In a molding machine, the combination of a pair of sand projectors, each comprising a projector-blade, a supporting arm, a motor at one end of the arm, and a sand conveyor on the arm, said arms being secured together, a pivotal support on which both arms can swing laterally, one of said blades being mounted to rotate longitudinally of the other, and power-driven mechanism for swinging said arms. 

